dmaengine: at_hdmac: Remove unused member of at_dma_chan

The pointer to at_dma engine was never used, remove it.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com
Link: https://lore.kernel.org/r/20221025090306.297886-32-tudor.ambarus@microchip.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/at_hdmac.c

@@ -253,7 +253,6 @@ enum atc_status {
 /**
  * struct at_dma_chan - internal representation of an Atmel HDMAC channel
  * @dma_chan: common dmaengine channel object members
- * @device: parent device
  * @ch_regs: memory mapped register base
  * @mask: channel index in a mask
  * @per_if: peripheral interface
@@ -273,7 +272,6 @@ enum atc_status {
  */
 struct at_dma_chan {
 	struct dma_chan		dma_chan;
-	struct at_dma		*device;
 	void __iomem		*ch_regs;
 	u8			mask;
 	u8			per_if;